Hydrosilylation reaction of various fluoroalkylated alkynes with Et3SiH in the presence of a catalytic amount of Co2(CO)8 was investigated. The hydrosilylation of the alkynes having fluoroalkyl and aryl groups took place smoothly with good regioselectivity (ca. 80:20). In sharp contrast, the reaction of the alkynes having a fluoroalkyl group and a benzyl-type substituent, or various propargyl alcohols gave the corresponding vinylsilanes in an excellent regio- and stereoselective manner. Treatment of the vinylsilanes with various aldehydes in the presence of Zn(OTf)2 and TBAF afforded the coupling products in good yields.
在催化剂 Co2(CO)8 的存在下,研究了各种氟烷基
炔烃与 Et3SiH 的氢
硅化反应。具有氟烷基和芳基的
炔烃顺利发生了氢
硅烷化反应,且具有良好的区域选择性(约为 80:20)。与此形成鲜明对比的是,具有氟烷基和苄基取代基的
炔烃或各种
丙炔醇以极好的区域和立体选择性反应生成相应的
乙烯基硅烷。在 Zn(OTf)2 和 TBAF 的存在下,用各种醛处理
乙烯基硅烷,可以得到产率很高的偶联产物。